===== Boot the Rescue from the DVD =====

This should be the same Arch as the installation: ie; 32 bit or 64 bit..

Once the DVD rescue gets to 'login', type: **root**\\
from there I run fdisk -l to confirm my HD partitition order.\\
We need to mount root (for me that's sda3)

  Now mount / (sda3) with:
Code:
  mount /dev/sda3 /mnt

To mount the other devices
Next do:
  mount --bind /dev /mnt/dev

Then chroot:
  chroot /mnt

  mount /proc
  mount /sys

Your prompt changes to: Rescue:/>
Here type:
  grub2-mkconfig -o /boot/grub2/grub.cfg
  grub2-install /dev/sda

Update the /etc/fstab with the new name of /boot partition

  exit
  # reboot

If you plan to move a / (root) partition, do as additionnal task a **mkinitrd -v**

 
If you use LVM please check this post: https://forums.opensuse.org/vbcms-comments/478290-article-re-install-grub2-dvd-rescue-3.html#post2519005

**N.B:** This method should also work from a live cd\\
This should be the same Arch as the installation: ie; 32 bit or 64 bit..USE LIVE CD TO RESCUE

If you plan to use LVM, to mount /, do :
  pvscan
  vgscan
  lvscan
  vgdisplay (or vgs)
  vgchange -ay 
  mount /dev/rootvg/slashlv /mnt